# US 2020/0400092 A1 · Method and system for correcting fuel injection amount > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0400092 A1 - Document ID: US20200400092A1 - Status: Published application - Kind: A1 - Application number: 16/678,578 - Filed: 2019-11-08 - Published: 2020-12-24 - Earliest claimed: 2019-06-18 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Jeong Sang OH - Web page: https://patentgrep.com/patent/US20200400092A1 ## CPC - F02D 41/3845: {by controlling the flow into the common rail, e.g. the amount of fuel pumped} - F02M 63/0225: {Fuel-injection apparatus having a common rail feeding several injectors (F02M63/0003 takes precedence); Means for varying pressure in common rails; Pumps feeding common rails} - F02M 65/001: {Measuring fuel delivery of a fuel injector} - F02M 65/003: {Measuring variation of fuel pressure in high pressure line} - F02D 2041/288: {for performing a transformation into the frequency domain, e.g. Fourier transformation} - F02D 2200/0602: Fuel pressure - F02D 2250/31: Control of the fuel pressure - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF ## Abstract A method and system for correcting a fuel injection amount that injects fuel may include applying a current value for injecting a target fuel amount and injecting fuel under a driving condition in which fuel injection is blocked; determining a frequency analysis value for a pressure signal of the fuel pressure rail when the fuel is injected; determining a fuel amount difference corresponding to a difference value between the frequency analysis value and a reference frequency analysis value stored in a data storage in advance; and correcting a current value of the injector which is applied to inject the target fuel amount to remove the fuel amount difference. ## Claims ### Claim 1 A method of correcting a fuel injection amount, the method comprising: applying a current value for injecting a target fuel amount to an injector of a fuel pressure rail and injecting fuel, upon determining, by a controller, that a fuel amount correction driving condition that does not requires fuel injection is satisfied; detecting a pressure signal of a fuel rail pressure from which the fuel is injected, upon determining, by the controller, that the fuel is injected; determining, by the controller, a frequency analysis value of the detected pressure signal; determining, by the controller, a fuel amount difference corresponding to a difference value between the determined frequency analysis value and a reference frequency analysis value stored in a data storage in advance; and correcting, by the controller, the current value of the injector, the current value of the injector being applied to inject the target fuel amount to remove the fuel amount difference. ### Claim 2 (depends on 1) The method of claim 1, wherein the current value for injecting the target fuel amount is applied to one of predetermined injectors of the fuel pressure rail, injecting fuel through a corresponding injector. ### Claim 3 (depends on 1) The method of claim 1, wherein the pressure signal is a signal which is detected by a pressure sensor mounted on the fuel pressure rail. ### Claim 4 (depends on 1) The method of claim 1, wherein the frequency analysis value is determined by analyzing the detected pressure signal through a Fast Fourier Transform (FFT) algorithm. ### Claim 5 (depends on 4) The method of claim 4, wherein the current value of the injector which is applied to inject the target fuel amount is corrected by: determining a maximum frequency analysis value for the target fuel amount through an analysis of the FFT algorithm; determining a difference value between the determined maximum frequency analysis value and a maximum reference frequency analysis value stored in the data storage for the target fuel amount; determining the fuel amount difference corresponding to the difference value; and determining the current value corresponding to the fuel amount difference. ### Claim 6 (depends on 1) The method of claim 1, wherein current value correction of the injector is sequentially performed on all injectors of the fuel pressure rail. ### Claim 7 (depends on 1) The method of claim 1, wherein current value correction of the injector is performed for each corresponding target fuel amount by differently setting target fuel amount to be learned. ### Claim 8 (depends on 1) The method of claim 1, wherein when the fuel amount correction driving condition is satisfied, the fuel is injected by applying a current value previously learned through correction. ### Claim 9 A system of correcting a fuel injection amount, the system comprising: a fuel injection controller that applies a current value for injecting a target fuel amount to an injector of a fuel pressure rail such that fuel is injected when a driving condition that does not require fuel injection is determined; a pressure signal analyzer that detects a pressure signal of the fuel pressure rail and determines a frequency analysis value of the detected pressure signal upon determining that fuel according to the target fuel amount is injected; a fuel difference calculator that determines a fuel amount difference corresponding to a difference value between a frequency analysis value for the determined target fuel amount and a reference frequency analysis value stored in a data storage in advance; and a fuel injection corrector that corrects the current value of the injector which is applied to inject the target fuel amount to remove the determined fuel amount difference. ### Claim 10 A system of correcting a fuel injection amount, the system comprising a controller configured of: applying a current value for injecting a target fuel amount to an injector of a fuel pressure rail such that fuel is injected when a driving condition that does not require fuel injection is determined; detecting a pressure signal of the fuel pressure rail and determining a frequency analysis value of the detected pressure signal upon determining that the fuel according to the target fuel amount is injected; determining a fuel amount difference corresponding to a difference value between a frequency analysis value for the determined target fuel amount and a reference frequency analysis value stored in a data storage in advance; and correcting the current value of the injector which is applied to inject the target fuel amount to remove the determined fuel amount difference. ### Claim 11 (depends on 1) The system of claim 1, wherein the current value for injecting the target fuel amount is applied to one of predetermined injectors of the fuel pressure rail, injecting fuel through a corresponding injector. ### Claim 12 (depends on 1) The system of claim 1, wherein the pressure signal is a signal which is detected by a pressure sensor mounted on the fuel pressure rail. ### Claim 13 (depends on 1) The system of claim 1, wherein the frequency analysis value is determined by analyzing the detected pressure signal through a Fast Fourier Transform (FFT) algorithm. ### Claim 14 (depends on 13) The system of claim 13, wherein the current value of the injector which is applied to inject the target fuel amount is corrected by: determining a maximum frequency analysis value for the target fuel amount through an analysis of the FFT algorithm; determining a difference value between the determined maximum frequency analysis value and a maximum reference frequency analysis value stored in the data storage for the target fuel amount; determining the fuel amount difference corresponding to the difference value; and determining the current value corresponding to the fuel amount difference. ### Claim 15 (depends on 10) The system of claim 10, wherein current value correction of the injector is sequentially performed on all injectors of the fuel pressure rail. ### Claim 16 (depends on 10) The system of claim 10, wherein current value correction of the injector is performed for each corresponding target fuel amount by differently setting target fuel amount to be learned. ### Claim 17 (depends on 10) The system of claim 10, wherein when the fuel amount correction driving condition is satisfied, the fuel is injected by applying a current value previously learned through correction.